Chain grate for furnaces



Dec. 1.4, 1926. 1,611,137 v w. R. woon Filed April 27, 1923 wmaatj mm woos.orroasts-emits.

a aa oaymea aa;i 7; -192s,{ Serial siesta; ad-1a; q ig i 1335112? 5 This invention relates to that 6r;- lCllitlll" grate stoker in which the joints of" alternate 'rowsfloflinks". are staggered, this a grate of this form form having advantages over that in which The objectof in "the links and in which a link cannot be disengaged while "the chain is straight for slightly curved butcanl'be .disengaged"when the curvature. is sufiicient', as when thechain is passingflover thef'd'rum.

Forthis purpose the link s of the kind; in which the slots are ofsuch form that. their open ends lie between lines draw'n through the to the length ends are outside theselines, and are in such position relativelyxto the ends of the link axes of the pins at right angles that when the links are engaged with the the link.

pins in the straight chain their ends substantially butt against each other.

When removal of a linkis necessary the chain is brought into such a position that the link in question is on the front surface of the front drum and the links in the transverse row on each Side of the row containing J the link to'be removed" are forced towards each other by pressure applied to their ends;

by a suitable device such as a clamp; the link in question can now be removed.

The application ofthis end pressure is facilitated by a flat surface on each end of The slotted link of this invention may be shaped toafl'ord air spaces betweenthem but there is considerable advantage in stamping the linksfrom steel sheet of uniform thickness. A steel link may be made comparatively very thin so that a larger number of them than of cast iron links'can.

' be contained in a-given width of grate and 7 the air spaces can be correspondingly more numerous. y Y

One form of link'according to-the invention is slightly bent either during 7 'ing or as a separate operation. Thusthe links may be in actual contact with each other and yet aflord the necessary air spaces so that distance pieces or bosses may be" avoided. I V One of the factors in determining the dimensions of the links-of a chain grate is the amount of surface presented by the link of the chain while their closed the stampnii'm cnarnjron .runnacnslfi ff' I a aie-eooiiagfeaea or as air assent... v tween the links;fifthissurface'isinsuficient the chain becomestoo' hot: For 'a given 7 y 1 number of air spacesa certain depth-oflink the' 'joints are 'in line with each'otherflin f V l V tr'ansverse'rows. v 5

isnecessar'y order that the-chain may be commonly .used is hardly feasible.

' h .p f st f it vention tl: e weight of :a chamgia'teis i r y reduced by cons'tructing thesteehlinks of small widthl andf small depth-as compared with the usual cast iron links. 'As already pointed out the small width determines a greatnumber of air- H suificiently'cooled In-the'c'aseof'castiron the invention. is'to provide p p in which tl' eflinksare engaged withfthe pins by means offslotsf spaces,-sothat the, depth of'the link may be diminished more than enough to make the weight of the chain less' than that of a cast iron chain providing, the same aggregate air space, notwithstanding the greater number.

of links.

Another advantage of a chain grate hav ing numerous narrow air spaces rather than a fBWWldGI spaces is that the'amount of riddlings passing through the grate is much reduced, r

In the accompanying drawings, Fig.1 a"

vertical section, through a drum carry ng one end of a chain grate stoker and Fig. 2'

isra part planof the chain grate.

The links a are carried by thepins. b which have at each end a suitablehead to prevent the links from' slipping laterally from the pins. The engagement of the links I with the pins is by means of the slots 0 which incline towards each other. as, shown.

The links in. each longitudinal row break the links on the row on each side It will be notedthat a link can be joint with of them.

lifted from the pins which engage it only when the pinsare caused to -approach each other this is possible only when the chain travelsjround the drum and the adjacent ends of thelinksare thereby moved away from each other. By stopping the drum and forcing towards each other the links which have-been moved apart in two successive -transverse roWsQA-the pins engaging these links maybe ma'de'tofapproach each other sulficiently to allow the operator. to lift from the pins 'the links whichalternate with y the first-named links' y A tool suitable'for compressing the chain in this manner is a curved clamp d," the jaws e of which are pivotedto its body and are thenext longitudinal-row, ast al;

to bring the jaws nearer togetlieri It then-- becomes possible to lift link aj from ts place.

The under surface of-eaoh link isformed with a recess, leaving a tooth 9 adapted to engage teeth It on the drum: which extend v alongthe periphery .parallelzto. the; axis,

Asshown in Fig: 2Ieacl1flink, is-sl-ightlyg cunved suthat therelis formed an airspace between it and the ends otthe two, v l1 Hav-ng thus described the nature the said invention and the best-v means I know of claim: I

l. A ohainqgrate {link piiovided, with means .to receive, supporting pins, said linkbeing of; unifonm thickness throughout its length" and, when inr'fue'l I snpporting posiparryingthe; sameintoj practical effectgi J p p be ng p1'QY1ded'W1thadriving;tooth on 'one.

tion,.,being laterally convegg toward, one side being, otuniform thickness throughout its length andprovided with means for receiving connecting pins, the end portions of each of said linksfbeing turned laterally from the, body portion thereof, substantially as 7 described, and for the purpose set iforth v3; A grate chain comprising a plurality of? links, arranged side by side, each link being ofnniform thickness throughout its 'length and provided with means for receiy; ngconnectmg p ns, the, end portions of each of said: links, be ng, turnedlatenally from.

the body portion}v thereof, and each link of its? edges.

' In? testimony. wheneqfflihaveisignedimyg V name-to this specifi'cationg. I WILFRED' ooin 1 

